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137 lines
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HTML
137 lines
8.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>找出最小值</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.min" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">min</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">min</span> — <span class="dc-title">找出最小值</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.min-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>min</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter">$values</code></span>
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) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>min</strong></span>
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( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$value1</code></span>
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, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$value2</code></span>
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[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$...</code></span>
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] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">
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如果仅有一个参数且为数组，<span class="function"><strong>min()</strong></span>
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返回该数组中最小的值。如果给出了两个或更多参数,
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<span class="function"><strong>min()</strong></span> 会返回这些值中最小的一个。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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PHP 会将非数值的 <span class="type"><a href="language.types.string.html" class="type string">string</a></span> 当成
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<em>0</em>，但如果这个正是最小的数值则仍然会返回一个字符串。如果多个参数都求值为
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<em>0</em> 且是最小值，<span class="function"><strong>min()</strong></span>
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会返回按字母表顺序最小的字符串，如果其中没有字符串的话，则返回数值的 <em>0</em>。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.min-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">values</code></dt>
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<dd>
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<p class="para">
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包含值的数组。
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</p>
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</dd>
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<dt>
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<code class="parameter">value1</code></dt>
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<dd>
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<p class="para">
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Any <a href="language.operators.comparison.html" class="link">comparable</a>
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value.
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</p>
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</dd>
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<dt>
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<code class="parameter">value2</code></dt>
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<dd>
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<p class="para">
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Any <a href="language.operators.comparison.html" class="link">comparable</a>
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value.
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</p>
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</dd>
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<dt>
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<code class="parameter">...</code></dt>
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<dd>
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<p class="para">
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Any <a href="language.operators.comparison.html" class="link">comparable</a>
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value.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.min-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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<span class="function"><strong>min()</strong></span> 返回参数中数值最小的。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.min-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-4133">
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<p><strong>Example #1 <span class="function"><strong>min()</strong></span> 用法的例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">min</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">6</span><span style="color: #007700">, </span><span style="color: #0000BB">7</span><span style="color: #007700">); </span><span style="color: #FF8000">// 1<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">min</span><span style="color: #007700">(array(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">4</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">)); </span><span style="color: #FF8000">// 2<br /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">min</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #DD0000">'hello'</span><span style="color: #007700">); </span><span style="color: #FF8000">// 0<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">min</span><span style="color: #007700">(</span><span style="color: #DD0000">'hello'</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">); </span><span style="color: #FF8000">// hello<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">min</span><span style="color: #007700">(</span><span style="color: #DD0000">'hello'</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">); </span><span style="color: #FF8000">// -1<br /><br />// 对多个数组，min 从左向右比较。<br />// 因此在本例中：2 == 2，但 4 < 5<br /></span><span style="color: #0000BB">$val </span><span style="color: #007700">= </span><span style="color: #0000BB">min</span><span style="color: #007700">(array(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">4</span><span style="color: #007700">, </span><span style="color: #0000BB">8</span><span style="color: #007700">), array(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">)); </span><span style="color: #FF8000">// array(2, 4, 8)<br /><br />// 如果同时给出数组和非数组作为参数，则不可能返回数组，因为<br />// 数组被视为最大的<br /></span><span style="color: #0000BB">$val </span><span style="color: #007700">= </span><span style="color: #0000BB">min</span><span style="color: #007700">(</span><span style="color: #DD0000">'string'</span><span style="color: #007700">, array(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">7</span><span style="color: #007700">), </span><span style="color: #0000BB">42</span><span style="color: #007700">); </span><span style="color: #FF8000">// string<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.min-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="max.html" class="function" rel="rdfs-seeAlso">max()</a> - 找出最大值</span></li>
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<li class="member"><span class="function"><a href="count.html" class="function" rel="rdfs-seeAlso">count()</a> - 计算数组中的单元数目，或对象中的属性个数</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |